Mac/iOS: Connecting to open Wi-Fi networks, like those in coffee shops, can leave you open to all sorts of attacks. To keep your personal information safe, free app Cloak encrypts and reroutes all your traffic through a VPN whenever you connect to a public Wi-Fi network.

When you're browsing from a public Wi-Fi connection—like at your favorite coffee shop—anyone…
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All you need to do is sign up for Cloak's service here, then download and install Cloak on your Mac. After you log in, it sits in your menu bar and waits for open Wi-Fi networks, securing you when you connect to one. If you have an iOS device, you can install the mobile app and just flip a switch in your device's settings to turn the VPN on. You can use the service for free for up to two hours or one gig per month, whichever comes first—which isn't that bad for most of us. For those of you that frequent coffee shops a bit more often, you can upgrade your account to a premium one, starting at an inexpensive $8 a month. Of course, if you already subscribe to a VPN service, you can use the similar, previously mentionedSidestep app to perform a similar function.